WO2003069824A2 - Transport block set transmission using hybrid automatic repeat request - Google Patents

Transport block set transmission using hybrid automatic repeat request Download PDF

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Publication number
WO2003069824A2
WO2003069824A2 PCT/US2003/004251 US0304251W WO03069824A2 WO 2003069824 A2 WO2003069824 A2 WO 2003069824A2 US 0304251 W US0304251 W US 0304251W WO 03069824 A2 WO03069824 A2 WO 03069824A2
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WO
WIPO (PCT)
Prior art keywords
transport block
block sets
time interval
transmission time
separated
Prior art date
Application number
PCT/US2003/004251
Other languages
French (fr)
Other versions
WO2003069824A3 (en
Inventor
Stephen E. Terry
Nader Bolourchi
Ariela Zeira
Original Assignee
Interdigital Technology Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Interdigital Technology Corporation filed Critical Interdigital Technology Corporation
Priority to CN03803820XA priority Critical patent/CN1633676B/en
Priority to AU2003213030A priority patent/AU2003213030A1/en
Priority to KR1020047012502A priority patent/KR100892913B1/en
Priority to JP2003568819A priority patent/JP2005518141A/en
Priority to CA2475859A priority patent/CA2475859C/en
Priority to EP03709072A priority patent/EP1483754A4/en
Priority to MXPA04007941A priority patent/MXPA04007941A/en
Publication of WO2003069824A2 publication Critical patent/WO2003069824A2/en
Publication of WO2003069824A3 publication Critical patent/WO2003069824A3/en
Priority to NO20043802A priority patent/NO334579B1/en
Priority to HK05106824.4A priority patent/HK1074690A1/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/004Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0041Arrangements at the transmitter end
    • H04L1/0042Encoding specially adapted to other signal generation operation, e.g. in order to reduce transmit distortions, jitter, or to improve signal shape
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/004Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0045Arrangements at the receiver end
    • H04L1/0047Decoding adapted to other signal detection operation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1822Automatic repetition systems, e.g. Van Duuren systems involving configuration of automatic repeat request [ARQ] with parallel processes
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829Arrangements specially adapted for the receiver end
    • H04L1/1835Buffer management
    • H04L1/1845Combining techniques, e.g. code combining
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867Arrangements specially adapted for the transmitter end
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867Arrangements specially adapted for the transmitter end
    • H04L1/1893Physical mapping arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055Physical resource allocation for ACK/NACK
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/04Wireless resource allocation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/20Control channels or signalling for resource management
    • H04W72/21Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/20Control channels or signalling for resource management
    • H04W72/23Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding

Definitions

  • This invention generally relates to wireless communication systems.
  • the invention relates to transmission of data in such systems where adaptive modulation & coding (AMC) and hybrid automatic repeat request (H-AMC)
  • AMC adaptive modulation & coding
  • H-AMC hybrid automatic repeat request
  • ARQ ARQ
  • FDD duplex
  • CDMA compact code division multiplex
  • OFDM orthogonal frequency division multiplex
  • the modulation and coding schemes (sets) used to transmit data are varied based on wireless channel conditions. To illustrate, a type of error
  • modulation type such as quadrature phase shift keying
  • carriers for an OFDM system may change. If channel characteristics improve, a
  • TTIs transmission time intervals
  • resource allocation dictates the maximum size of the TBS that can be supported
  • H-ARQ hybrid automatic repeat request
  • mechanism may be used to maintain QOS and improve radio resource efficiency.
  • a system using H-ARQ is shown in Figure 1.
  • a transmitter 20 transmits a TBS
  • the TBS is
  • An H-ARQ decoder 30 decodes the received TBS. If the
  • an ARQ transmitter 28 requests a
  • TBS is a cyclic redundancy check (CRC).
  • An ARQ receiver 22 receives the
  • Retransmissions may apply a more robust modulation and coding set to increase
  • the H-ARQ decoder 30 combines, the received TBS versions. A requirement for combining is that combined TBSs are identical. If the resulting quality is still insufficient, another retransmission is requested. If the resulting quality is sufficient, such as the combined TBS passes
  • the received TBS is released for further processing.
  • the H-ARQ mechanism allows for data received with unacceptable quality to be
  • coding set may be determined necessary to achieve successful delivery of a
  • the largest TBS size is applied to the least robust modulation and coding set
  • modulation and coding set for successful transmission such as when a TBS size
  • the TBS size used must correspond to the most
  • the TBS can be retransmitted using the old modulation and coding
  • the RLC error detection, data recovery and buffering of a TBS queued in the node-B results in increased block error rates and data latency
  • Data is to be transmitted in a wireless communication system within a
  • the wireless communication system uses adaptive
  • a transmission time interval has a plurality of transport block sets.
  • block sets are transmitted with a first specified modulation and coding scheme.
  • Each transport block set is received and a determination is made as to whether
  • the transport block sets meet a specified quality.
  • a repeat request is transmitted.
  • At least one of the transport block sets is
  • the retransmitted transport block set is received.
  • retransmitted transport block set may be combined with a corresponding
  • Figure 1 is an embodiment of a wireless H-ARQ communication system.
  • FIGS 2A-2D are illustrations of a TTI having multiple TBSs.
  • Figures 3A-3C are embodiments of a wireless H-ARQ communication
  • Figure 4 is a flow chart of changing the modulation and coding set prior
  • Figure 5 is an illustration of changing the modulation and coding set
  • Figure 6 is an illustration of changing the modulation and coding set
  • FIG. 7 is an illustration of overlapping TBSs in a TDD/CDMA communication system.
  • Figure 8 is an illustration of non-overlapping TBSs in a TDD/CDMA communication system.
  • FIGS 2A, 2B, 2C and 2D illustrate a TTI having multiple TBSs, TBS t
  • FIG. 2A illustrates multiple TBSs dividing a TTI by time, such as for
  • FIG. 2B illustrates multiple TBSs divided by
  • FIG. 2D illustrates dividing multiple TBSs by sub-
  • Each TBS is sized to allow
  • the most robust MCS may only have the capacity to
  • the most robust modulation coding set in practice, the most robust set may actually
  • the least robust modulation and coding set may have the capacity to
  • the least robust modulation coding set in practice, the least robust set may
  • the TBS is sized, preferably, to allow for transmission with the most
  • TBSs of this size are applied within the TTI to achieve maximum data rates, and when greater transmission
  • Figure 3A is a simplified diagram of a transmitter 44 and receiver 46
  • the transmitter 44 may be
  • the receiver 46 may be located at either a user equipment or a base station/Node-B.
  • the receiver 46 may
  • AMC is typically only used in the downlink.
  • transport block set transmission can be applied to the uplink.
  • a transmitter 301 to 30 N (30) transmits each TBS, TBSi to TBSN, over
  • the number of TBSs in the TTI depends on the TBS size
  • the TTI may only
  • TBSs are sent in the TTI. Alternately, some TBSs are sent in the TTI. Alternately, some TBSs are sent in the TTI. Alternately, some TBSs are sent in the TTI. Alternately, some TBSs are sent in the TTI. Alternately, some
  • TBSs may be destined for a different receiver 46 ⁇ to 46 ⁇ (46), as shown in Figure 3B. Each TBS may also be sent to a different receiver 46i to 46N (46), as shown in Figure 3C. This flexibility allows for greater radio resource utilization and efficiency.
  • a receiver 38 ⁇ to 38N (38) receives each transmitted TBS.
  • a H-ARQ A H-ARQ
  • decoder 42i to 42N (42) decodes each received TBS. Although in Figure 3 one
  • transmitter 30, receiver 38 and H-ARQ decoder 42 is shown for each TBS, one transmitter 30, receiver 38 and H-ARQ decoder 42 may handle all the TBSs. For each TBS failing the quality test, a request for retransmission is made by the
  • An ARQ receiver 32 receives the request and directs the request
  • TBS(s) appropriate TBS(s) to be retransmitted.
  • the retransmitted TBS(s) are combined
  • TBS(s) passes the quality test, it is released for further processing. Since a TTI
  • TBS can contain multiple TBSs, preferably, a failure in one TBS does not necessarily
  • An AMC controller 34 is also shown in Figures 3A, 3B and 3C. If the channel conditions change, the AMC controller may initiate a change in the
  • FIG. 4 is a flow diagram
  • a TTI is
  • a TTI has three
  • TBSs, TBSi, TBS 2 and TBS3 applied at the least robust modulation and coding
  • step 54 the prior TBS transmission, (step 54). As shown in Figure 5, only TBS 2 is retransmitted and it is combined with the prior TBS 2 transmission.
  • this example illustrates sending only one TBS at the more robust modulation
  • Figure 6 is an illustration of multiple TBSs requiring retransmission.
  • TBSi Three TBSs, TBSi, TBS 2 and TBS 3) are transmitted in a TTI.
  • a change in the modulation and coding set occurs such that only one TBS can be sent at a time.
  • each TBS is
  • a TTI can be transmitted at the least robust
  • ARQ retransmission can be made at a more robust modulation and coding set
  • radio resources can be used more aggressively.
  • TBSs may overlap in time. As illustrated in Figure 7, a first TBS in a TTI uses
  • a resource unit is the use of one code
  • a second TBS has the "B" resource units. As shown in Figure 7, in
  • both the first and second TBS are transmitted. Accordingly,
  • each time slot only contains one TBS of a
  • a first TBS (A) is the only TBS in slots one and
  • the second TBS (“B") is the only TBS in slots three and four.
  • each TBS is assigned a TBS
  • each TBS is assigned a separate sub-carrier for transmission.

Abstract

Data of a time transmission interval is to be transmitted in a wireless communication system. The wireless communication system uses adaptive modulation and coding and has automatic repeat request mechanism. A transmission time interval has a plurality of transport block sets. The transport block sets are transmitted with a first specified modulation and coding scheme. Each transport block set is received and a determination is made as to whether the transport block sets meet a specified quality (50). When the specified quality is not met, a repeat request is transmitted (51). The specified modulation and coding scheme is changed to a second specified modulation and coding scheme that may support a reduced number of TBS's within the transmission time interval. In response to the repeat request, at least one of the transport block sets is retransmitted. The retransmitted transport block set is received. The retransmitted transport block set may be combined with a corresponding previously received transport block set (51).

Description

[0001] TRANSPORT BLOCK SET TRANSMISSION
USING HYBRID AUTOMATIC REPEAT REQUEST
[0002] BACKGROUND
[0003] This invention generally relates to wireless communication systems. In particular, the invention relates to transmission of data in such systems where adaptive modulation & coding (AMC) and hybrid automatic repeat request (H-
ARQ) techniques are applied.
[0004] In wireless communication systems, such as the third generation
partnership project (3GPP) time division duplex (TDD) or frequency division
duplex (FDD) communication systems using code division multiple access
(CDMA) or orthogonal frequency division multiplex (OFDM) systems, AMC is
used to optimize the use of air resources.
[0005] The modulation and coding schemes (sets) used to transmit data are varied based on wireless channel conditions. To illustrate, a type of error
encoding (such as turbo versus convolutional coding), coding rate, spreading
factor for CDMA system, modulation type (such as quadrature phase shift keying
versus M-ary quadrature amplitude modulation), and or adding/subtracting sub-
carriers for an OFDM system may change. If channel characteristics improve, a
lower data redundancy and/or "less robust" modulation and coding set is used to
transfer data. As a result, for a given allocation of radio resources, more user
data is transferred resulting in a higher effective data rate. Conversely, if
channel characteristics degrade, a higher data redundancy "more robust" modulation and coding set is used, transferring less user data. Using AMC, an optimization between air resource utilization and quality of service (QOS) can be
better maintained.
[0006] Data in such systems is received for transfer over the air interface in transmission time intervals (TTIs). Data within a TTI transferred to a particular
user equipment is referred to as a transport block set (TBS). For a particular
allocation of air resources, a less robust modulation and coding set allows for
larger TBS sizes and a more robust modulation and coding set only allows for
smaller TBS sizes. As a result, the modulation and coding set for a given radio
resource allocation dictates the maximum size of the TBS that can be supported
in a given TTI..
[0007] In such systems, a hybrid automatic repeat request (H-ARQ)
mechanism may be used to maintain QOS and improve radio resource efficiency.
A system using H-ARQ is shown in Figure 1. A transmitter 20 transmits a TBS
over the air interface using a particular modulation and coding set. The TBS is
received by a receiver 26. An H-ARQ decoder 30 decodes the received TBS. If the
quality of the received data is unacceptable, an ARQ transmitter 28 requests a
retransmission of the TBS. One approach to check the quality of the received
TBS is a cyclic redundancy check (CRC). An ARQ receiver 22 receives the
request and a retransmission of the TBS is made by the transmitter 20.
Retransmissions may apply a more robust modulation and coding set to increase
the possibility of successful delivery. The H-ARQ decoder 30 combines, the received TBS versions. A requirement for combining is that combined TBSs are identical. If the resulting quality is still insufficient, another retransmission is requested. If the resulting quality is sufficient, such as the combined TBS passes
the CRC check, the received TBS is released for further processing. The H-ARQ mechanism allows for data received with unacceptable quality to be
retransmitted to maintain the desired QOS.
[0008] In a system using both H-ARQ and AMC, a change in modulation and
coding set may be determined necessary to achieve successful delivery of a
requested TBS retransmission. In this situation, the maximum amount of
physical data bits allowed within the TTI varies with the modulation and coding
set.
[0009] Since only one TBS exists per TTI the effective user data rate
corresponds to the TBS size applied to each TTI. To achieve maximum data rates the largest TBS size is applied to the least robust modulation and coding set
within the TTI. When wireless channel conditions require a more robust
modulation and coding set for successful transmission, such as when a TBS size
can not be supported within the TTI. Therefore, when operating at the maximum
data rate, each time a more robust modulation and coding requirement is realized, all outstanding transmissions in H-ARQ processes that have not been
successfully acknowledged must be discarded.
[00010] When Incremental Redundancy (IR) is applied, TBS data must remain
constant in retransmissions for proper combining. Therefore, to guarantee that a TBS retransmission can be supported at a more robust modulation and coding set
then the initial transmission, the TBS size used must correspond to the most
robust MCS. However, when a TBS size allowed by the most robust modulation and coding set is applied the maximum data rate to the mobile is reduced, and when a less robust modulation and coding set is applied physical resources are
not fully utilized.
[00011] When the TBS size is not supported by the more robust modulation and coding set, the TBS can be retransmitted using the old modulation and coding
set. However, if the channel conditions dictate that a more robust modulation
and coding set be used or the initial transmission was severally corrupted, the
combining of the retransmitted TBSs may never pass, resulting in a transmission
failure.
[00012] In current implementations, when a TBS can not be successfully transmitted by AMC & H-ARQ mechanisms, recovery is handled by the radio link
control (RLC) protocol (at layer two). Unlike a H-ARQ recovery of failed
transmissions, the RLC error detection, data recovery and buffering of a TBS queued in the node-B, results in increased block error rates and data latency,
potentially resulting in a failure to meet QOS requirements.
[00013] Accordingly, to provide maximum data rates with minimal H-ARQ
transmission failures, it is desirable to support incremental redundancy and
allow adaptation of modulation and coding sets in such systems.
[00014] SUMMARY
[00015] Data is to be transmitted in a wireless communication system within a
transmission time interval. The wireless communication system uses adaptive
modulation and coding and has automatic repeat request mechanism. A transmission time interval has a plurality of transport block sets. The transport
block sets are transmitted with a first specified modulation and coding scheme.
Each transport block set is received and a determination is made as to whether
the transport block sets meet a specified quality. When the specified quality is not met, a repeat request is transmitted. The specified modulation and coding
scheme is changed to a second specified modulation and coding scheme that may
support a reduced number of TBS's within the transmission time interval. In
response to the repeat request, at least one of the transport block sets is
retransmitted. The retransmitted transport block set is received. The
retransmitted transport block set may be combined with a corresponding
previously received transport block set.
[00016] BRIEF DESCRIPTION OF THE DRAWING(S)
[00017] Figure 1 is an embodiment of a wireless H-ARQ communication system.
[00018] Figures 2A-2D are illustrations of a TTI having multiple TBSs.
[00019] Figures 3A-3C are embodiments of a wireless H-ARQ communication
system using AMC with TTIs capable of having multiple TBSs.
[00020] Figure 4 is a flow chart of changing the modulation and coding set prior
to a H-ARQ retransmission.
[00021] Figure 5 is an illustration of changing the modulation and coding set
prior to a retransmission of a single TBS.
[00022] Figure 6 is an illustration of changing the modulation and coding set
prior to a retransmission of all three TBSs. [00023] Figure 7 is an illustration of overlapping TBSs in a TDD/CDMA communication system.
[00024] Figure 8 is an illustration of non-overlapping TBSs in a TDD/CDMA communication system.
[00025] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT(S)
[00026] Figures 2A, 2B, 2C and 2D illustrate a TTI having multiple TBSs, TBSt
to TBSN. Figure 2A illustrates multiple TBSs dividing a TTI by time, such as for
use in a TDD/CDMA system. Figure 2B illustrates multiple TBSs divided by
codes, such as for use in a FDD/CDMA or TDD/CDMA system. Figure 2C
illustrates dividing multiple TBSs by time and codes, such as for use in
TDD/CDMA system. Figure 2D illustrates dividing multiple TBSs by sub-
carriers, such as for use in an OFDM system. Each TBS is sized to allow
transmission with the most robust modulation coding set for the allocated
resources. To illustrate, the most robust MCS may only have the capacity to
support a maximum 2,000 bit TBS within the TTI. Although referred to as the
most robust modulation coding set, in practice, the most robust set may actually
be a more robust set, if the most robust modulation coding set is unlikely to be
needed. The least robust modulation and coding set may have the capacity to
support a maximum of 20,000 bit TBS within the TTI. Although referred to as
the least robust modulation coding set, in practice, the least robust set may
actually be a less robust set, if the least robust modulation coding set is unlikely
to be needed. [00027] The TBS is sized, preferably, to allow for transmission with the most
robust modulation and coding set within a TTI. Then when the least robust
modulation and coding set is applied, multiple TBSs of this size are applied within the TTI to achieve maximum data rates, and when greater transmission
reliability is required for successful delivery the most robust modulation and coding set can be applied.
[00028] Figure 3A is a simplified diagram of a transmitter 44 and receiver 46
for transmitting a TTI having one or multiple TBSs. The transmitter 44 may be
located at either a user equipment or a base station/Node-B. The receiver 46 may
be located at either a base station/Node-B or a user equipment. In current
system implementations, AMC is typically only used in the downlink.
Accordingly, the preferred implementation of transmission is for use in
supporting AMC for the downlink. For other systems using AMC in the uplink,
transport block set transmission can be applied to the uplink.
[00029] A transmitter 301 to 30N (30) transmits each TBS, TBSi to TBSN, over
the air interface 36. The number of TBSs in the TTI depends on the TBS size
and the modulation and coding set used for transmission. If the most robust
modulation and coding set is used to ensure successful delivery, the TTI may only
support one TBS. If a lesser robust modulation and coding set is used to achieve
higher effective data rates, multiple TBSs are sent in the TTI. Alternately, some
TBSs may be destined for a different receiver 46ι to 46κ (46), as shown in Figure 3B. Each TBS may also be sent to a different receiver 46i to 46N (46), as shown in Figure 3C. This flexibility allows for greater radio resource utilization and efficiency.
[00030] A receiver 38ι to 38N (38) receives each transmitted TBS. A H-ARQ
decoder 42i to 42N (42) decodes each received TBS. Although in Figure 3 one
transmitter 30, receiver 38 and H-ARQ decoder 42 is shown for each TBS, one transmitter 30, receiver 38 and H-ARQ decoder 42 may handle all the TBSs. For each TBS failing the quality test, a request for retransmission is made by the
ARQ transmitter 40. An ARQ receiver 32 receives the request and directs the
appropriate TBS(s) to be retransmitted. The retransmitted TBS(s) are combined
by the H-ARQ decoder(s) 42 and another quality test is performed. Once the
TBS(s) passes the quality test, it is released for further processing. Since a TTI
can contain multiple TBSs, preferably, a failure in one TBS does not necessarily
require retransmission of the entire TTI, which more efficiently utilizes the radio
resources.
[00031] An AMC controller 34 is also shown in Figures 3A, 3B and 3C. If the channel conditions change, the AMC controller may initiate a change in the
modulation and code set used to transfer data. Figure 4 is a flow diagram
illustrating such a change occurring in AMC between retransmissions. A TTI is
transmitted having multiple TBSs and afterwards, a change in the modulation
and coding set occurs, (step 50). To illustrate using Figure 5, a TTI has three
TBSs, TBSi, TBS2 and TBS3 applied at the least robust modulation and coding
set to achieve the maximum data rate. The modulation and coding set in Figure
5 changes so that only one TBS can be transmitted subsequently. Referring back to Figure 4, at least one of the TBSs is received with an unacceptable quality and
a retransmission is required, (step 52). In the illustration of Figure 5, TBS2
requires retransmission, as shown by a large "X". The TBS requiring
retransmission is sent at the new modulation and coding set and combined with
the prior TBS transmission, (step 54). As shown in Figure 5, only TBS2 is retransmitted and it is combined with the prior TBS2 transmission. Although
this example illustrates sending only one TBS at the more robust modulation and
coding set, it is also possible that two TBSs could be transmitted with the more
robust modulation and coding set within the TTI.
[00032] Figure 6 is an illustration of multiple TBSs requiring retransmission.
Three TBSs, TBSi, TBS2 and TBS3) are transmitted in a TTI. A change in the modulation and coding set occurs such that only one TBS can be sent at a time.
All three TBSs are received with an unacceptable quality. A request for
retransmission is sent for all three TBSs. Sequentially, each TBS is
retransmitted, as shown by retransmission 1, retransmission 2 and
retransmission 3 in separate TTIs. The retransmitted TBSs are combined with
the prior transmissions. A similar procedure is used, if two TBSs are transmitted
with the more robust modulation and coding set within the TTI.
[00033] As illustrated, multiple TBSs allow for maximum data rates and
incremental redundancy. A TTI can be transmitted at the least robust
modulation and coding set achieving the maximum data rate and subsequent H-
ARQ retransmission can be made at a more robust modulation and coding set
ensuring greater probability for successful transmission. By allowing incremental redundancy, radio resources can be used more aggressively. A more
aggressive (less robust) modulation and coding set can be used to achieve higher
data rates and radio resource efficiency, since transmission can be made using a
more conservative (more robust) set to maintain QOS, if channel conditions
degrade.
[00034] In a TDD/CDMA communication system, such as in the 3GPP system,
two preferred approaches for implementing multiple TBSs within a TTI use
either overlapping or non-overlapping time slots. In overlapping time slots, the
TBSs may overlap in time. As illustrated in Figure 7, a first TBS in a TTI uses
the resource units having an "A" in them. A resource unit is the use of one code
in a time slot. A second TBS has the "B" resource units. As shown in Figure 7, in
the second time slot, both the first and second TBS are transmitted. Accordingly,
the two TBSs' transmissions overlap in time.
[00035] In non-overlapping TBSs, each time slot only contains one TBS of a
TTI. As illustrated in Figure 8, a first TBS ("A") is the only TBS in slots one and
two. The second TBS ("B") is the only TBS in slots three and four.
[00036] In a FDD/CDMA communication system, such as in the third
generation partnership project proposed system, transmissions occur
simultaneously. In a FDD/CDMA system, preferably each TBS is assigned a
different code/frequency pair for transmission. In an OFDM system, preferably
each TBS is assigned a separate sub-carrier for transmission.

Claims

CLAIMS What is claimed is:
1. A method for transmitting data of a transmission time interval in a
wireless communication system using adaptive modulation and coding and having a physical layer hybrid automatic repeat request mechanism, the method comprising:
providing a transmission time interval having a plurality of transport
block sets;
transmitting the transport block sets with a first specified modulation and
coding scheme;
receiving each transport block set and determining whether the received
transport block sets meet a specified quality;
when the specified quality is not met, transmitting a repeat request;
changing the specified modulation and coding scheme to a second specified
modulation and coding scheme;
in response to the repeat request, retransmitting at least one of the
transport block sets;
receiving the retransmitted transport block set; and
combining the retransmitted transport block set with a corresponding
previously received transport block set.
2. The method of claim 1 wherein the specified quality is determined using a circular redundancy test.
3. The method of claim 1 wherein the specified quality determination
is made on each received transport block set and only the received transport
block sets not meeting the specified quality are retransmitted.
4. The method of claim 1 for use in a time division duplex/code division
multiple access communication system, wherein the transmitted transport block
sets are separated by time.
5. The method of claim 1 for use in a code division multiple access
communication system wherein the transmitted transport block sets are
separated by codes.
6. The method of claim 1 for use in a time division duplex/code division
multiple access communication system wherein the transmitted transport block
sets are separated by time and codes.
7. The method of claim 1 for use in an orthogonal frequency division
multiple access communication system wherein the transport block sets are
separated by sub-carriers.
8. A base station for transmitting data of a transmission time interval
using adaptive modulation and coding and having a physical layer hybrid
automatic repeat request mechanism, the base station comprising: a transmitter for transmitting data of a transmission time interval with a
first specified modulation and coding scheme, the transmission time interval
having a plurality of transport block sets and in response to receiving a repeat
request, for retransmitting at least one of the transport block sets; and
an adaptive modulation and coding controller for changing the specified modulation and coding scheme to a second specified modulation and coding
scheme.
9. The base station of claim 8 using a time division duplex/code
division multiple access air interface, wherein the transmitted transport block
sets are separated by time.
10. The base station of claim 8 using a code division multiple access air
interface wherein the transmitted transport block sets are separated by codes.
11. The base station of claim 8 using a time division duplex/code division multiple access air interface wherein the transmitted transport block
sets are separated by time and codes.
12. The base station of claim 8 using an orthogonal frequency division
multiple access air interface wherein the transport block sets are separated by
sub-carriers.
13. A base station for transmitting data of a transmission time interval
using adaptive modulation and coding and having a physical layer hybrid
automatic repeat request mechanism, the base station comprising:
means for transmitting data of a transmission time interval with a first
specified modulation and coding scheme, the transmission time interval having a
plurality of transport block sets;
means for changing the specified modulation and coding scheme to a
second specified modulation and coding scheme; and
means in response to receiving a repeat request, for retransmitting at least
one of the transport block sets.
14. The base station of claim 13 using a time division duplex/code
division multiple access air interface, wherein the transmitted transport block
sets are separated by time.
15. The base station of claim 13 using a code division multiple access air
interface wherein the transmitted transport block sets are separated by codes.
16. The base station of claim 13 using a time division duplex/code
division multiple access air interface wherein the transmitted transport block
sets are separated by time and codes.
17. The base station of claim 13 using an orthogonal frequency division
multiple access air interface wherein the transport block sets are separated by
sub-carriers.
18. A user equipment for receiving data of a transmission time interval, the transmission time interval data transmitted using adaptive modulation and
coding, the user equipment using a physical layer hybrid automatic repeat request mechanism for the received transmission time interval data, the user equipment comprising:
at least one receiver for receiving the transmission time interval data, the
transmission time interval data having a plurality of transport block sets, and for
receiving at least one retransmitted transport block set, the at least one
retransmitted transport block set transmitted using a second specified
modulation and coding scheme;
a hybrid automatic repeat request decoder for determining whether data of
each of the transport block sets meet a specified quality, and for combining the
at least one retransmitted transport block set with a corresponding previously
received transport block set; and an automatic repeat request transmitter for when the specified quality is
not met, for transmitting a repeat request.
19. The user equipment of claim 18 wherein the specified quality is
determined using a circular redundancy test.
20. The user equipment of claim 18 wherein the specified quality
determination is made on each received transport block set and only the received
transport block sets not meeting the specified quality are retransmitted.
21. The user equipment of claim 18 wherein the received transmission time interval data is in a time division duplex/code division multiple access
format, and the transport block sets of the are separated by time.
22. The user equipment of claim 18 wherein the received transmission
time interval data is in a code division multiple access format, and the transport
block sets of the are separated by codes.
23. The user equipment of claim 18 wherein the received transmission
time interval data is in a time division duplex/code division multiple access
format, and the transport block sets of the are separated by time and codes.
24. The user equipment of claim 18 wherein the received transmission
time interval data is in orthogonal frequency division multiple access format, and
the transport block sets of the are separated by sub-carriers.
25. A user equipment for receiving data of a transmission time interval,
the transmission time interval data transmitted using adaptive modulation and coding, the user equipment using a physical layer hybrid automatic repeat request mechanism for the received transmission time interval data, the user
equipment comprising:
means for receiving the transmission time interval data, the transmission
time interval data having a plurality of transport block sets;
means for determining whether data of each of the transport block sets
meet a specified quality;
means for when the specified quality is not met, for transmitting a repeat
request;
means for receiving at least one retransmitted transport block set, the at
least one retransmitted transport block set transmitted using a second specified
modulation and coding scheme; and
means for combining the at least one retransmitted transport block set
with a corresponding previously received transport block set.
26. The user equipment of claim 25 wherein the specified quality is
determined using a circular redundancy test.
27. The user equipment of claim 25 wherein the specified quality
determination is made on each received transport block set and only the received
transport block sets not meeting the specified quality are retransmitted.
28. The user equipment of claim 25 wherein the received transmission
time interval data is in a time division duplex/code division multiple access format, and the transport block sets of the are separated by time.
29. The user equipment of claim 25 wherein the received transmission
time interval data is in a code division multiple access format, and the transport block sets of the are separated by codes.
30. The user equipment of claim 25 wherein the received transmission
time interval data is in a time division duplex/code division multiple access
format, and the transport block sets of the are separated by time and codes.
31. The user equipment of claim 25 wherein the received transmission
time interval data is in orthogonal frequency division multiple access format, and
the transport block sets of the are separated by sub-carriers.
PCT/US2003/004251 2002-02-13 2003-02-11 Transport block set transmission using hybrid automatic repeat request WO2003069824A2 (en)

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CN03803820XA CN1633676B (en) 2002-02-13 2003-02-11 Transport block set transmission using hybrid automatic repeat request
AU2003213030A AU2003213030A1 (en) 2002-02-13 2003-02-11 Transport block set transmission using hybrid automatic repeat request
KR1020047012502A KR100892913B1 (en) 2002-02-13 2003-02-11 Transport block set transmission using hybrid automatic repeat request
JP2003568819A JP2005518141A (en) 2002-02-13 2003-02-11 Transport block set transmission using hybrid automatic repeat request
CA2475859A CA2475859C (en) 2002-02-13 2003-02-11 Transport block set transmission using hybrid automatic repeat request
EP03709072A EP1483754A4 (en) 2002-02-13 2003-02-11 Transport block set transmission using hybrid automatic repeat request
MXPA04007941A MXPA04007941A (en) 2002-02-13 2003-02-11 Transport block set transmission using hybrid automatic repeat request.
NO20043802A NO334579B1 (en) 2002-02-13 2004-09-10 Transport block kit transfer using hybrid automatic repeat request
HK05106824.4A HK1074690A1 (en) 2002-02-13 2005-08-09 Transport block set transmission using hybird automatic repeat request

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US60/357,224 2002-02-13
US10/279,393 2002-10-24
US10/279,393 US7287206B2 (en) 2002-02-13 2002-10-24 Transport block set transmission using hybrid automatic repeat request

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JP2008502220A (en) * 2004-06-04 2008-01-24 クゥアルコム・インコーポレイテッド Coding and modulation for broadcast and multicast services in wireless communication systems
US8582596B2 (en) 2004-06-04 2013-11-12 Qualcomm Incorporated Coding and modulation for broadcast and multicast services in a wireless communication system
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US8638771B2 (en) 2005-08-12 2014-01-28 Qualcomm Incorporated Transmission structure supporting multi-user scheduling and MIMO transmission
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